Figure 2: PC stimulated the production of collagens. Micromasses of OA meniscal cells were cultured in the absence of PC ((a); magnification 10x) or the presence of 1 mM PC ((b); magnification 10x) for 14 days. These micromasses were then processed and stained with picrosirius red. Note the much stronger picrosirius red staining in the PC-treated micromass than that in the untreated micromass.